Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d78181355e26d42…

MALICIOUS

PDF

76.8 KB Created: 2021-08-27 22:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a0aa8b229c94cea93525b0fe6d7b7a2 SHA-1: 740a336c5e3d4f31f7864a3754bdea7680de74a9 SHA-256: 5d78181355e26d42b41ec5be01e22a2d24aa020276371c1bf5ae59c70fc61a63
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified numerous embedded URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/de20d93604fa7348dd5692a40dc49ea5/rutupuravejedediwiraf.pdf In PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/24109136890.pdfIn PDF document text
    • https://pcetravel.com/files/file/84592228854.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/20077061593.pdfIn PDF document text
    • http://sooclose.eu/upload/File/rexizegaruzuxew.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/16468112287.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16103e4a645933---57100005490.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/13678469513.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/38b6169b6ca2c23faa46afdf2c3ebe4d/65714669669.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/ralurab.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/bivaremesowowemunalog.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f726220f75d2dca772a6b67a5295b99b/wonidatavolewivajuvit.pdfIn PDF document text
    • https://nevisnews.com/userfiles/nalupotigegedulezekizibiz.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/76894963286.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/semazelaxolujido.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/wiwone.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/60992857887.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb13812814b---5620850350.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210622_F96203CA5878DDCA.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/zisulisumefosojun.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fdf372836ebd4065b73e90775555b391/61293242632.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/89743431428.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/noxigeledefu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f59e239c---59336734844.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=english+english+dictionary+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 17040 bytes
SHA-256: 0119ff6ae592b327568f998058c1d7769f8764dbbef79c65df8c800854a500dc
font_02_sfnt_off00010af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 11084 bytes
SHA-256: 8695b7e1709b23e5e1aaa3c102cc876050943bd6eb7dbfc7c72aa2b489a2fa46